I printed addresses on all my STDs and my Invitations and response envelopes. I think technically ettiquette says to hand write them but I don't have beautiful handwriting and I wasn't going to pay for calligraphy if I could print them for free at home in a pretty font.
For std's I justed used clear labels, they aren't formal. For my invites I am going to try to print on the envelope if that doesn't work I'm screwed lol
I have horrible handwriting so it didn't even occur to me to hand write the envelopes. I used clear labels. I think for STD there is no "supposed to" since they are not required.
Re: STD Envelopes
Wedding date 10/8/10
EDD 5/9/13
Make a pregnancy ticker